Annual report pursuant to Section 13 and 15(d)

DEFINED CONTRIBUTION AND PENSION PLANS - Allocation of Plan Assets (Details)

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DEFINED CONTRIBUTION AND PENSION PLANS - Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Oct. 31, 2019
Mar. 31, 2019
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments $ 511,786 $ 534,768 $ 477,137 $ 495,343 $ 478,350
Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   32,561      
Equity investments- UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   1,518      
Equity investments- non UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   2,345      
Insurance linked securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   27,870      
Illiquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   25,938      
Liquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   102,373      
Property debt          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   34,078      
Alternatives          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   48,013      
Diversified growth (absolute return) funds          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   1,242      
Government debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   85,817      
Corporate debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   1,656      
Insurance policy          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   171,357      
Fair Value, Inputs, Level 1, 2 and 3          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 459,523        
Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 22,252        
Fair Value, Inputs, Level 1, 2 and 3 | Equity investments- UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 1,053        
Fair Value, Inputs, Level 1, 2 and 3 | Equity investments- non UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 2,897        
Fair Value, Inputs, Level 1, 2 and 3 | Insurance linked securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 27,386        
Fair Value, Inputs, Level 1, 2 and 3 | Liquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 98,130        
Fair Value, Inputs, Level 1, 2 and 3 | Alternatives          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 51,801        
Fair Value, Inputs, Level 1, 2 and 3 | Diversified growth (absolute return) funds          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 790        
Fair Value, Inputs, Level 1, 2 and 3 | Government debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 99,157        
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 1,712        
Fair Value, Inputs, Level 1, 2 and 3 | Insurance policy          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 154,345        
Level 1          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 10,043 13,108      
Level 1 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 3,591 5,933      
Level 1 | Equity investments- UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 1,053 1,518      
Level 1 | Equity investments- non UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 2,897 2,345      
Level 1 | Insurance linked securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 1 | Illiquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   0      
Level 1 | Liquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 1 | Property debt          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   0      
Level 1 | Alternatives          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 1 | Diversified growth (absolute return) funds          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 790 1,242      
Level 1 | Government debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 414      
Level 1 | Corporate debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 1,712 1,656      
Level 1 | Insurance policy          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 2          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 295,135 290,287      
Level 2 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 18,661 26,628      
Level 2 | Equity investments- UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 2 | Equity investments- non UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 2 | Insurance linked securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 27,386 27,870      
Level 2 | Illiquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   0      
Level 2 | Liquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 98,130 102,373      
Level 2 | Property debt          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   0      
Level 2 | Alternatives          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 51,801 48,013      
Level 2 | Diversified growth (absolute return) funds          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 2 | Government debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 99,157 85,403      
Level 2 | Corporate debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 2 | Insurance policy          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 154,345 231,373      
Level 3 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Equity investments- UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Equity investments- non UK          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Insurance linked securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Illiquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   25,938      
Level 3 | Liquid credit          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Property debt          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments   34,078      
Level 3 | Alternatives          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Diversified growth (absolute return) funds          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Government debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Corporate debt securities          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 0 0      
Level 3 | Insurance policy          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments 154,345 $ 171,357      
Net asset value          
Defined Benefit Plan, Plan Assets, Category [Line Items]          
Total fair value investments $ 52,263